Hysteresis or reluctance motor systems

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318701000

Hysteresis or reluctance motor systems

36

20100156337

APPARATUS AND METHOD FOR DRIVING 2-PHASE SRM MOTOR - Disclosed is an apparatus and method for driving a 2-phase SRM. The method comprises initializing 2-phase based on a detected position of a rotor by an initializing sensor at the time of an initial driving, and normally driving 2-phase based on a detected position of the rotor by a driving sensor. Accordingly, a sufficient amount of torque is generated when the 2-phase SRM is driven at a high speed. The apparatus comprises an initializing sensor which detects each position of each phase of a 2-phase SRM, and generates an initializing sensor signal based on the detected result; a driving sensor which detects each position of each phase of the 2-phase SRM, and generates a driving sensor signal based on the detected result; and a microprocessor which initially drives the 2-phase SRM based on the initializing sensor signal at the time of an initial driving, and normally drives the 2-phase SRM based on the driving sensor signal at the time of a normal driving.

06-24-2010

20140062379

SWITCHED RELUCTANCE MOTORS AND EXCITATION CONTROL METHODS FOR THE SAME - Provided are multiple switched reluctance motors and excitation control methods for same. Motors with various structures are provided having the same structural characteristics, a stator formed of an even number of salient pole pairs and a rotor formed of an even number of salient pole pairs. The salient poles of the stator salient pole pairs are arranged opposite the salient poles of the rotor salient pole pairs, with minimal air gaps left between said salient pole pairs, thus leaving the shortest magnetic return paths between the stator salient pole pairs and the rotor salient pole pairs arranged opposite one another, thus satisfying the minimum reluctance principle of the switched reluctance motor. In addition, due to the magnetic isolation between each stator salient pole pair, the performance of the magnetic pole of each stator salient pole pair is controlled by an excitation control power source and changed independently.

03-06-2014

20160028343

FAULT TOLERANT CONTROL SYSTEM FOR MULTI-PHASE PERMANENT MAGNET ASSISTED SYNCHRONOUS RELUCTANCE MOTORS - A fault tolerant control system for a multi-phase permanent magnet assisted synchronous reluctance motor utilizes vector control to provide safe operation under various phase loss fault conditions. Specifically, the vector control of the present invention utilizes a fault tolerant algorithm that receives a torque input and an electrical current feedback signal from the motor. Thus, in the presence of a fault condition, the vector control applies the optimal torque angle to the motor, while reducing the phase currents to an optimized value to lessen the saturation effect in the motor, so as to ensure that the motor delivers maximum torque output in the presence of such faults. As such, the control system allows the motor to operate safely with high reliability, which is highly desirable, such as in electric vehicles and the aerospace industry.

01-28-2016

20110260672

HIGH POWER DENSITY SWITCHED RELUCTANCE MACHINES WITH HYBRID EXCITATION - A switched reluctance machine having salient stator and rotor poles. Alternating ones of the stator poles having windings and the others having permanent magnets attached on their pole faces. The alternate stator pole windings are provided with polarities that are suitable for unidirectional and bidirectional current operation of the switched reluctance machine. The alternate poles with permanent magnets in the switched reluctance machines can have also concentric windings placed on them and excited with currents to further augment the flux linkages in the stator poles. The windings on the poles with permanent magnets can be excited from the same source as the windings on the poles without permanent magnets to enhance power output or provide power factor correction.

10-27-2011

20100090640

MOTOR CONTROLLER, MOTOR CONTROL SYSTEM, AND WASHING MACHINE - A motor controller controlling a permanent magnet motor including a rotor provided with a plurality of low coercivity permanent magnets having a coercivity low enough to allow modification in amount of magnetization, the motor controller including a position detector including one or more position sensors to detect a rotational position of the rotor; an inverter circuit connected between a direct current voltage supply source and windings of the permanent magnet motor and configured by a plurality of semiconductor switching elements of multiple phases connected thereto; and a magnetization controller that magnetizes the plurality of low coercivity permanent magnets constituting the rotor by energizing the windings of the permanent magnet motor through the inverter circuit such that all of the low coercivity permanent magnets are magnetized to a uniform level of magnetization by energizing the windings twice at same timings specified based on a sensor signal outputted by the position sensor.

04-15-2010

20130328517

FPDA Closed Loop Electric Drives Controls - A control system for a switched reluctance (SR) machine is provided. The control system may include a converter circuit that is operatively coupled to the SR machine, and a controller in communication with the converter circuit. The controller may be configured to execute two or more processes in parallel, wherein the processes include generating a torque command based on one or more of bus voltage, machine current, rotor speed and rotor position, determining a first set of current control parameters based on the torque command and the rotor speed, determining a second set of current control parameters based on one or more of the torque command, the rotor speed and the rotor position, selecting one of the first and second sets of current control parameters based on the rotor speed, and operating the gates according to the selected set of current control parameters.

12-12-2013

20160036366

TORQUE RIPPLE AND RADIAL FORCE REDUCTION IN DOUBLE-ROTOR SWITCHED RELUCTANCE MACHINES - A double-rotor switched reluctance machine includes a stator, a first rotor, and a second rotor. The stator and the first rotor operate as a first electric machine and the stator and the second rotor operate as a second electric machine. Each electric machine has an output torque profile that fluctuates periodically between a maximum and a minimum instantaneous torque. The double-rotor switched reluctance machine is configured so that when the first and second electric machines are operated at a common electrical frequency, the first and second maximum instantaneous torques are temporally offset, thereby reducing the overall torque ripple of the switched reluctance machine. Additionally, or alternatively, a double-rotor switched reluctance machine is configured so that the first and second rotors are radially offset from each other to reduce a net radial force imposed on the stator by the operation of the first and second electric machines.

SWITCHED RELUCTANCE MACHINE - A reluctance machine includes a stator and a rotor. The stator and rotor have a same number of poles. The rotor is configured to rotate about an axis of rotation. Each stator pole is formed of a primary stator pole and an auxiliary stator pole. The auxiliary stator pole is axially aligned with the primary stator pole in the direction of the axis of rotation. Each rotor pole has a length extending in the direction of the axis of rotation sufficient to at least partially cover the primary stator pole and axially aligned auxiliary stator pole. The primary stator poles are actuated with an alternating magnetic field orientation, and the auxiliary stator poles are also actuated with an alternating magnetic field orientation. The field orientations for the primary and auxiliary stator poles are, however, opposite each other such that a primary stator pole its axially aligned auxiliary stator pole have opposite magnetic field orientations.

03-03-2011

20120169267

FULL-PITCH WINDINGS SWITCHED RELUCTANCE MOTOR - A full-pitch winding switched reluctance motor is provided. In this motor, one set of current components are estimated, which electromagnetically act on only one set of stator poles for one phase. Based on the estimated one set of current components, current components for respective three phases are controlled, resulting in accurate current control with no electromagnetic interactions with other phases. This current control allows a control circuit to be made compact, and a motor with effective field means can be provided.

07-05-2012

20140184131

METHOD AND APPARATUS OF CONTROLLING SWITCHED RELUCTANCE MOTOR - Disclosed herein are a method and apparatus of controlling a switched reluctance motor (SRM). The method of controlling driving of an SRM, the method includes: sensing a variation of a load of the SRM; and controlling both of a dwell angle and a PWM duty ratio of the SRM according to the variation of the load of the SRM. Therefore, an angle and a current are simultaneously controlled, thereby making it possible to decrease a torque ripple at a low speed and constantly control a torque and rapidly respond to a command speed at a high speed. In addition, a speed and a torque of the SRM may be more precisely controlled.

07-03-2014

20120326652

HIGH POWER-DENSITY, HIGH EFFICIENCY, NON-PERMANENT MAGNET ELECTRIC MACHINE - A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P

12-27-2012

20130207588

INITIAL DRIVING APPARATUS AND METHOD OF TWO-PHASE SRM - Disclosed herein are an initial driving apparatus and method of a two-phase switched reluctance motor (SRM). The initial driving apparatus of a two-phase SRM includes: a driving unit; a current measuring unit; a memory; and a controlling unit comparing the currents measured in the current measuring unit and a difference between the currents with the data currents and the difference between the data currents stored in the memory to determine an initial position, thereby initially driving the SRM. Therefore, the two-phase SRM may be stably operated.

08-15-2013

20110025253

Single Switch Controlled Switched Reluctance Machine - An improved single-switch control circuit for use in a multi-phase switched reluctance machine is provided. The control circuit includes at least first and second phase windings, a switch, a capacitor, and a diode. The capacitor may have a polarity opposite that of a power source in the control circuit. The first winding may be connected in series with the switch and connected in parallel with a circuit block comprising the second winding. The second winding may be connected in parallel with the capacitor and in series with the diode. In operation, the switch may be used to redirect current from the first winding to the second winding. The capacitor can become charged by the redirected current until it eventually stores enough energy to essentially discontinue current flow in the first winding. Then, the capacitor can discharge its stored energy as a current through the second winding. In this manner, substantially all of the energy from the first winding can be transferred to the second winding.

02-03-2011

20130076292

SR MOTOR CONTROL APPARATUS - An SR motor control apparatus includes: a first half-bridge circuit connected to a neutral node of an SR motor; a second half-bridge circuit connected to a U-phase coil of the SR motor; a third half-bridge circuit connected to a V-phase coil of the SR motor; a fourth half-bridge circuit connected to a W-phase coil of the SR motor; and a switching unit including at least two power modules on which the first to fourth half-bridge circuits are mounted.

03-28-2013

20130009589

SYSTEM AND METHOD FOR CONTROLLING FOUR-QUADRANT OPERATION OF A SWITCHED RELUCTANCE MOTOR DRIVE THROUGH A SINGLE CONTROLLABLE SWITCH - Regulating the speed of a two-phase switched reluctance machine (TPSRM) rotor includes selecting either a motoring mode or braking mode of operation for the TPSRM, regulating the rotor speed, when the motoring mode is selected, using a control signal cooperatively produced by a speed control feedback loop and a current control feedback loop; and regulating the rotor speed, when the braking mode is selected, using a control signal produced by the current control feedback loop without the cooperation of the speed control feedback loop. The speed control feedback loop uses an established speed control signal and a signal indicative of the rotor's speed to dynamically adjust a first parameter governing the control signal. The current control feedback loop uses an established current control signal and a signal indicative of the current flowing through a stator winding of the TPSRM to dynamically adjust a second parameter governing the control signal.

01-10-2013

20130293181

SWITCHING CONTROL APPARATUS FOR TWO PHASE SWITCHED RELUCTANCE MOTOR AND METHOD THEREOF - Disclosed herein are a switching control apparatus for a two phase switch reluctance motor and a control method using the same. The switching control apparatus includes a rectifier; and an active converter including a pair of common switches, a pair of first phase switches, a pair of serially connected second phase switches, a plurality of current feedback diodes each connected to the switches, and a pair of drivers controlling the switches and operated as operation modes 1 to 3 to provide the commercial power provided from the rectifier to the two phase SRM and drive the two phase SRMs.

11-07-2013

20120056575

ELECTRIC VEHICLE WITH SWITCHED RELUCTANCE MOTOR POWER PLANT - A reluctance machine includes a stator and a rotor. The stator and rotor have a same number of poles. The rotor is configured to rotate about an axis of rotation. Each stator pole is formed of a primary stator pole and an auxiliary stator pole. The auxiliary stator pole is axially aligned with the primary stator pole in the direction of the axis of rotation. Each rotor pole has a length extending in the direction of the axis of rotation sufficient to at least partially cover the primary stator pole and axially aligned auxiliary stator pole. The primary stator poles are actuated with an alternating magnetic field orientation, and the auxiliary stator poles are also actuated with an alternating magnetic field orientation. The field orientations for the primary and auxiliary stator poles are, however, opposite each other such that a primary stator pole its axially aligned auxiliary stator pole have opposite magnetic field orientations.

03-08-2012

20120104987

METHOD OF CONTROLLING CURRENT OF HIGH-SPEED SWITCHED RELUCTANCE MOTOR - Disclosed herein is a method of controlling the current of a high-speed Switched Reluctance Motor (SRM) using an inverter circuit including a first switching element, a second switching element, a first diode, a second diode and a reactor, wherein the first switching element and the first diode, the second diode and the second switching element are connected to a bridge circuit, and one end of the reactor is connected to the junction of the first switching element and the first diode, and the remaining end of the reactor is connected to the junction of the second diode and the second switching element; and excitation mode, free-wheeling mode-

05-03-2012

20130147416

Switching Strategy for Switched Reluctance Machine - A method of controlling a motor is provided. The method may determine a speed of the motor, and engage a soft chopping routine on a first switch and a second switch of each phase if the motor speed is relatively low. The first switch may be driven by a first pulse width modulated PWM signal and the second switch being driven by a second PWM signal. The first and second PWM signals may be alternatingly configured such that at least one of the first switch and the second switch is closed at any point during the distributed soft chopping routine and both the first switch and the second switch are never simultaneously open.

06-13-2013

20100123426

RELUCTANCE MOTOR WITH IMPROVED STATOR STRUCTURE - In a motor, a stationary member is provided with a number M (M is a positive integer) of first poles within 360 electrical degrees at spaces therebetween. A plurality of windings are at least partly wound in the spaces, respectively. A movable member is movably arranged relative to the stationary member and provided with a number K (K is a positive integer) of second poles. The number K of second poles is different from the number M of first poles. A unidirectional current supply unit supplies a unidirectional current to at least one of the windings so as to create an attractive force between at least one of the first poles and a corresponding at least one of the second poles to thereby move the movable member relative to the stationary member.

05-20-2010

20120091940

AC MOTOR AND CONTROL APPARATUS FOR THE SAME - An AC motor is provided. In the AC motor, there are M pieces (M is an integer of 3 or more) of stator pole groups SPG are arranged in a rotor axis direction, where each of the stator poles groups is composed of a plurality of stator poles which are for the same phase and arranged in a circumferential direction of the motor. Between the stator pole groups SPG, “M−1” pieces of annular windings WR are arranged which allow one-way current to flow therethrough. The windings WR are arranged such that the directions of current passing therethrough are reversed in turn in the rotor axis direction. The stator pole groups SPG are excited to generate magnetic fluxes φG directed in a one way. The excited directions of the magnetic fluxes φG are reversed in turn in the rotor axis direction.

APPARATUS FOR SELECTING SPEED OF ELECTRICALLY COMMUTATED MOTOR FOR USE IN HVAC SYSTEM - A DC motor system includes a plurality of speed taps coupled to an AC source and a variable speed DC motor. A circuit determines which speed taps are coupled to the AC source, outputs corresponding logic signals, and isolates digital circuits from the AC source. A digital logic device accesses from memory a value corresponding to the upper limit speed of the variable speed DC motor, determines a commanded motor speed based at least in part on the logic signals and the upper limit speed value, and outputs a pulse width modulated signal having a duty cycle corresponding to the determined commanded motor speed. A driver receives the pulse width modulated signal and outputs a corresponding signal. The variable speed DC motor receives the driver output signal, and rotates a rotor at a speed corresponding to the pulse width modulated signal duty cycle.

10-27-2011

20130134920

MOTOR APPARATUS - A motor apparatus includes a full-pitch winding type reluctance motor which has three phase coils formed of full-pitch windings, and a controller which controls applying current to each coil of the three phases. When changing from a state where current is applied to a first phase coil and a second phase coil to a state where current is applied to a third phase coil and the first phase coil, the controller displaces the timing when decreasing the current of the second phase coil is started and the timing when increasing the current of the third phase coil is started from each other.

05-30-2013

20150381098

SWITCHED RELUCTANCE MOTOR DEVICE, AND DRIVING CIRCUIT AND RELUCTANCE MOTOR THEREOF - A switched reluctance motor device includes first and second winding components wound around a stator one on top of the other, multiple damping capacitors, a capacitor battery unit and a switching circuit. The first winding component has multiple first winding portions coupled in series to form a close loop. The second winding component has multiple second winding portions coupled in a star configuration and cooperating with the damping capacitors to form multiple resonant circuits. The switching circuit switches one first winding portion from a magnetizing state to a demagnetizing state, and induces generation of a resonant current in the corresponding resonant circuit to charge the capacitor battery unit.

12-31-2015

20140042952

APPARATUS AND METHOD FOR PREVENTING SENSING ERROR IN SRM - Disclosed herein are an apparatus and method for preventing a sensing error in a switched reluctance motor (SRM). The apparatus includes: a rectifying unit; a main controlling unit driven by power supplied from the rectifying unit, and operated in an error mode in the case in which the rotation speed of the rotor is decreased to a predetermined value or less; a voltage detecting; and an error preventing unit preventing an operation of the main controlling unit in an error mode at the time of reconnection of a power supply when it is sensed that the power has been blocked using the variation in the supplied voltage detected by the voltage detecting unit.

02-13-2014

20090045768

SINGLE SWITCH CONTROLLED SWITCHED RELUCTANCE MACHINE - An improved single-switch control circuit for use in a multi-phase switched reluctance machine is provided. The control circuit includes at least first and second phase windings, a switch, a capacitor, and a diode. The capacitor may have a polarity opposite that of a power source in the control circuit. The first winding may be connected in series with the switch and connected in parallel with a circuit block comprising the second winding. The second winding may be connected in parallel with the capacitor and in series with the diode. In operation, the switch may be used to redirect current from the first winding to the second winding. The capacitor can become charged by the redirected current until it eventually stores enough energy to essentially discontinue current flow in the first winding. Then, the capacitor can discharge its stored energy as a current through the second winding. In this manner, substantially all of the energy from the first winding can be transferred to the second winding.

02-19-2009

20090160391

HYBRID PERMANENT MAGNET MOTOR - An electro-mechanical device that functions as a motor or a generator and methods for constructing and using such electro-mechanical device are provided. The electro-mechanical device features permanent magnets placed in a magnetically attracting manner and inter-dispersed between control coils. The control coils are energized to create a flux opposing the flux of the permanent magnets and to create a rotational torque on the poles of a salient pole rotor before those poles align with the poles of the energized control coil stator segment. Power can be generated by placing the flux of the control coils in a steady state and mechanically rotating the salient pole rotor. The electro-mechanical device provides little or no cogging forces, high-efficiency operation, and a high power density.

06-25-2009

20080211447

Motion Control Using Electromagnetic Forces - Motion control using electromagnetic forces. The control of motion in unpowered apparatus and an apparatus driven by electric motors and/or other prime movers utilizes electromagnetic force/torque for control of motion. One objective is to extend the domain of electric motor speed control, traditionally characterized by electronic techniques, to small apparatus such as bubble vibration toys, paper dispensers, toothbrushes and other appliances.

09-04-2008

20080284368

Apparatus and Method for Driving 2-Phase Srm - Disclosed is an apparatus and method for driving a 2-phase SRM capable of individually performing an initial driving by an initializing sensor and a normal driving by a driving sensor, and capable of controlling a rotation speed of the SRM by delaying a phase signal by a half period and then generating a pulse width modulation signal based on the period. The apparatus comprises: a driving sensor which detects a position of a rotor thus to generate a driving sensor signal based on a result of the detection; a microprocessor which generates a 1-phase signal and a 2-phase signal based on a rising time and a falling time of the driving sensor signal at the time of a normal driving; an oscillator which generates first and second pulse width modulation signals delayed by a preset time; and a multiplying unit which multiplies the 1-phase and 2-phase signals with the first and second pulse width modulation signals, and generates 1-phase and 2-phase driving signals based on a result of the multiplication.

11-20-2008

20090153095

Driving Circuit for Single-Phase Switched Reluctance Motor and Driving Method Thereof - Disclosed are a driving circuit for a single-phase SRM and a driving method thereof. The driving circuit for the single-phase SRM includes a switched reluctance motor, a voltage source which supplies energy to the switched reluctance motor, and an inverter circuit which is connected to the switched reluctance motor in parallel so as to temporarily store energy of the voltage source, and then supply the energy to the switched reluctance motor.

MOTOR DRIVER SYSTEM AND METHOD FOR CONTROLLING MOTOR DRIVER - A motor driver system and its control methods are discussed. Even when a command magnetic flux decreases as a motor operates in a field weakening region, a current angle can be maintained always below a limit value, thereby obtaining the stability of the motor control.